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| -rw-r--r-- | ChangeLog | 4 | ||||
| -rw-r--r-- | malloc/malloc.c | 7 |
2 files changed, 11 insertions, 0 deletions
@@ -1,3 +1,7 @@ +2004-09-08 Ulrich Drepper <drepper@redhat.com> + + * malloc/malloc.c (_int_free): Add inexpensive double free test. + 2004-09-08 Roland McGrath <roland@redhat.com> * malloc/mcheck.c: Don't use __P. diff --git a/malloc/malloc.c b/malloc/malloc.c index 5636d5cfb0..4db40514d6 100644 --- a/malloc/malloc.c +++ b/malloc/malloc.c @@ -4201,6 +4201,13 @@ _int_free(mstate av, Void_t* mem) set_fastchunks(av); fb = &(av->fastbins[fastbin_index(size)]); + /* Another simple check: make sure the top of the bin is not the + record we are going to add (i.e., double free). */ + if (__builtin_expect (*fb == p, 0)) + { + malloc_printf_nc (check_action, "double free(%p)!\n", mem); + return; + } p->fd = *fb; *fb = p; } |